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I don't know of any specific designs. Some things that I've seen that help is using a mesh on top of the chimney to catch large burning debris (cinders, etc.) and have the fire box in far enough where someone can't build a fire close to the edge where it can roll out onto the deck. Something like having a hearth. Even if it's on the ground instead of a deck, the grass can dry out in a drought and catch if there's adequate fuel and alchohol consumption. I'll try to ask around here (eastern Pa.) and see if there's any standard.
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